Edwakd egbert schmid



Patented May 7' 311 9 21 I u UNITED .5

F IC M EDWARD Bonnier scmvm), or vEao NAQNEw JERSEY, .nssrenon mownsrinertousn LAMPHCQMIPIANYLA CQRPORATION or PE NSY VANIA."

c nAsme oE MEN'rQ,

No Drawing.

This invention relates to an adhe SiVejcompos tion and more particularly to a cement which may beemployed for securing a metallio base to the glass bulb of an incandes p I I for apply nga base to thebulb ogf alamp cent electric lamp. 7 I o An object of :he invention is toprovide an effective and economically "manufactured heat-resistant cement; 1 i Another object 1 of the which maybe maintained in its, plastic state for a considerable lengthof timeunder atmospheric conditioner f e I v Although my cement may have other uses, itis particularly adapted for securing the base to la bulbl'o'f jan ,electricincandescent lamp and willl'hereinafter be termed abas- I by nixing the several ingredients when in a dry powdered state and then adding a solvent. The operatlon of dry mixing causes Eng cement.- Alcenient, for this purpose must possess aproperty whichwlll make it ad-' hereto metal and glass in a high degree and my composition has this necessary adhesive property aswell as others whichwill hereinafter be set forth,

One ofjthe basing cements which is at;

present used-to a considerable extent incleaned, which obviously increases the cost of production. Furthermore, when bakel te is employedas above mentioned, it has been considered necessary to prepare the cement considerable inconvenience, inasmuch as the flying particles of 'the substance are detrlmental to the healthfoi' the workman and great care must be exercised 1 to prevent the workman from matter. p c,

The above disadvantagesare avoided by my invention which also possesses otherad a cement of this" characteris employed will be given in order that thereader may apvantages which will hereinafter be set forth, A basing cement must possess certain qualities peculiar to the use to which it is put,

and the conditions under which it ishandled.

A brief outline of the manner in which preciate more fully the value of, a cement invention is the provision ofxa plast c adhesive composition;

inhaling the finely divided- Application filed many 27,1922. ,Seri'al No. 539,755.,

which has the necessary adhesive property, and which .will remain plastic for several daysi'under normal atmospheric conditions.

Automatic machines are usually employed and certain types of suchmachines necess ta'te the prefilhng of the bases, i. ve,

a .given amount of cement is squirted into, each vbase,'fi'a plurality of such bases being a1 7 "ranged upona tray for convenient handling.

These trays, with the filledbases thereon, are

disposed adjacent the automatic machines I, withinrea'ch of the operator who inserts a base in the machine and then'juXtapose-s a bulb in such manner with respec to the base that the cement may be firmly compressed between the baseand the bulb by an actuation of the machine. The parts, after compressiomaremoved into and through an oven to effect a volatilization o fone of the ingredients of the cement, thuscausing it to become hardened or baked aud to -be firmly secured to the metal base and the glass bulb,;thus bonding thesetwo parts together. As It is desirable, as a matter of economy, to prefill alarge number of the .baseswith cement preparatory to their. application to the basing machine, and as considerable time passes before the supplyv is exhausted,it will e obvious that it is important to provide until the'basosoareflapplied to the bulb; all other conditionsbeing equal. l When ajquantity of cement made in accordance with the present invention is disa cement which retains'its plastic condition 1 posed within a base and permitted to stand for ashort interval of time, a thin non;

porousfilm or skin forms on: the surface of the composition, thereby entra ping the mam portion and preventing it" rom further volatilization. "It is apparent, therefore, I

that'bases may be prefilled in 'desirable quantities,jand,as needed',applied tothe ma chine. Tliis permits [the continuous opera-- tion ofabasing'inachine. I I

The composition :whiclr- -I employ and which gives the-desired results is producedf by" the admixture, in suitable "proportions,

ofa volatile solvent such asalcohol,-methyl alcohol, denatured alcohol No.- 1 or 5, a rosin or substance, such as shellac, which is soluble in alcohol or the solventfemployed, and an inert andfinely divided filler as, for

instance, "marble flour, ground "feldspar, groundbarytes or other-inorganic filler,

For the purpose of hastening the dividing action of the solvent, a relatively small amount of rosin or other suitable substance such for example as sandarac resin or acaroid resin is included in the mixture.

By combining the above ingredients in the proper proportions, a plastic composition may be obtained which will retain its plastic state for at least several days under normal atmospheric conditions because of the above mentioned film which forms on the surface thereof. By the addition of a substance which will effect an acceleration of the action of the solvent, the formation of the film is quickened.

Although I may use any suitable gum of the resinous group. I find that good results are obtained when shellac is used, with other ingredients, as illustrated by the following formula:

Per cent. Shellac 11.9 Rosin 3. 1 Marble flour 85.0

For the preparation of a cement according to the. above formula, the several ingredients given are ground to a line powder and are then thoroughly mixed, a sufficient amount of alcohol being added to give the proper doughy consistency to the mixture.

The following formula is another example of a cement from which good results have been obtained.

Per cent. Albertol 11.9 Rosin 3.1 Marble flour 85.0

These ingredients are ground to a fine powder and are thoroughly mixed together with a suflicient amount of alcohol to give a mixture of the proper consistency. By employing albertol or other synthetic gum in the place of shellac an equally eflic'ient cement is obtained but at a considerably reduced cost.

If a cement having a high degree of temperature resistance is desired, any hightemperature-resistance material as, for instance, bakelite, may be added to the composition. A cement of this character, from which good results have beenobtained, may be compounded from the following formula:

. Per cent. Shellac Bakelite 6.0

Rosin 2.5

Marble flour 85.5

These ingredients are finely ground and then mixed with a sufficient amount of a volatile solvent. such as alcohol, until a plastic mixture of the desired plasticity is obtained.

The inclusion of a relatively small amount of bakelite with the other ingredients of my composition increases the temperature resistance of the composition with comparatively small additional cost.

Although my cement is particularly adapted for use in securing bases to bulbs of incandescent lamps, it is obvious that it may have a more general application as a temperature resistance cement. It is also to be understood that, by soluble resins, I mean to include, shellac, or other substances having similar properties.

What is claimed is:

1. A cement consisting of shellac, alcohol, an inorganic inert filler, and a relatively small amount of resin to effect an acceleration of the rate of solution of the shellac in the alcohol.

2. A cement consisting of shellac and bakelite in equal proportions, an inorganic inert filler, alcohol for dissolving said shellac and bakelite and rosin for hastening a film on the surface of the cement to prevent relatively rapid hardening of the major portion thereof.

3. A cement consisting of shellac and bakelite in equal proportions, an inorganic inert filler, alcohol for dissolving said shellac and bakelite and a lesser proportion of rosin than either the shellac or bakelite for hastening the formation of a film on the cement to prevent relatively rapid hardening of the major portion thereof.

4, A cement consisting of the following substances substantially in the proportion by weight indicated: shellac about 11.9%, rosin about 3.1%, marble flour about 85% and a water soluble volatile solvent in suit- EDWARD ROBERT SCHMID. 

